The pair entered the Late Shop, Wigan Road, Deane, just after 10.50pm on June 22, with one man threatening staff with the wrench as his accomplice stole cash and cigarettes.
The man armed with the wrench was white, in his early 20s, 6ft tall, slim and wore a hooded top. The second man was white, in his early 20s, 5ft 6ins to 5ft 8ins tall with short dark hair and wore a navy blue jacket.
Anyone with information is asked to contact Bolton police on 0161 72 5050 or the confidential freephone Crimestoppers hot-line on 0800 555111.
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